Tolong dibantu dg pake cara kak ya, pr ini harus disetor besok pagi

b) L = ½ × (a + b) × t
1260 = ½ × (37 + 23) × t
1260 = ½ × 60 × t
1260 = 30 × t
t = 1260 : 30 = 42

c) L = ½ × (a + b) × t
1008 = ½ × (35 + b) × 36
1008 = 18 × (35 + b)
35 + b = 1008 : 18
35 + b = 56
b = 56 - 35 = 21

d) L = ½ × (a + b) × t
2678 = ½ × (a + 45) × 52
2678 = (a + 45) × 26
a + 45 = 2678 : 26
a + 45 = 103
a = 103 - 45 = 58